TY - JOUR
T1 - Observations of defect structure evolution in proton and Ni ion irradiated Ni-Cr binary alloys
AU - Briggs, Samuel
AU - Barr, Christopher
AU - Pakarinen, Janne
AU - Mamivand, Mahmood
AU - Hattar, Khalid
AU - Morgan, Dane
AU - Taheri, Mitra
AU - Allen, Todd
N1 - Score=10
PY - 2016/6/27
Y1 - 2016/6/27
N2 - Two binary Ni-Cr model alloys with 5 wt.% Cr and 18 wt.% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni4+ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.
AB - Two binary Ni-Cr model alloys with 5 wt.% Cr and 18 wt.% Cr were irradiated using 2 MeV protons at 400 and 500 °C and 20 MeV Ni4+ ions at 500 °C to investigate microstructural evolution as a function of composition, irradiation temperature, and irradiating ion species. Transmission electron microscopy (TEM) was applied to study irradiation-induced void and faulted Frank loops microstructures. Irradiations at 500 °C were shown to generate decreased densities of larger defects, likely due to increased barriers to defect nucleation as compared to 400 °C irradiations. Heavy ion irradiation resulted in a larger density of smaller voids when compared to proton irradiations, indicating in-cascade clustering of point defects. Cluster dynamics simulations were in good agreement with the experimental findings, suggesting that increases in Cr content lead to an increase in interstitial binding energy, leading to higher densities of smaller dislocation loops in the Ni-18Cr alloy as compared to the Ni-5Cr alloy.
KW - Radiation damage
KW - Frank loops
KW - voids
KW - nickel alloys
KW - Scanning/transmission electron microscopy (STEM)
UR - http://ecm.sckcen.be/OTCS/llisapi.dll/open/21890199
U2 - 10.1016/j.jnucmat.2016.06.046
DO - 10.1016/j.jnucmat.2016.06.046
M3 - Article
SN - 0022-3115
VL - October 2016
SP - 48
EP - 58
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
ER -